Alright, let's work through 2615 times 1990 step by step
2615 × 1990 = 1990 × (2615)
+ 1990 × 5 which equals 9950
+ 1990 × 10 producing 19900
+ 1990 × 600 giving us 1194000
+ 1990 × 2000 what gives us 3980000

= 5203850
